I need to think about the other committees that conduct investigations. I can tell you that this has happened before. It's a common practice. According to the evidence given by the Clerk of the Privy Council, the public service seems to be taking this approach. The Privy Council Office considers that it's bound by the Access to Information Act and that it has no choice but to proceed in this manner.
We see this practice and it comes up from time to time, as it did with the documents concerning Afghanistan.